Cellular localisation of the proteins of region 3 of feline enteric coronavirus

Abstract

Feline enteric coronaviruses have three open reading frames (ORFs) in region 3 (3a, 3b, and 3c). All three ORFs were expressed with C-terminal eGFP and 3xFLAG tags in different cell lines and their localisation was determined. ORF 3a is predicted to contain DNA-binding and transcription activator domains, and it is localised in the nucleus and in the cytoplasm. ORF 3b is also predicted to contain DNA-binding and activator domains, and was found to localise in the mitochondrion. Besides that, in some of the non-infected and FIPV-infected cells nucleolar, perinuclear or nuclear membrane accumulation of the eGFP-tagged 3b was observed. The exact compartmental localisation of ORF 3c is yet to be determined. However, based on our co-localisation studies 3c does not seem to be localised in the ER-Golgi network, ERGIC or peroxisomes. The expression of 3c-eGFP is clearly cell type dependent, it is more stable in MARC 145 cells than in Fcwf-4 or CrFK cells, which might reflect in vivo stability differences of 3c in natural target cells (enterocytes vs. monocytes/macrophages).

Keywords

FECV; FIPV; coronavirus; ORF; mitochondrial localisation; nucleolar localisation

Published in

Acta Veterinaria Hungarica
2018, Volume: 66, number: 3, pages: 493-508 Publisher: AKADEMIAI KIADO ZRT

SLU Authors

• Belak, Sandor

  • Department of Animal Biosciences, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Clinical Science


Publication identifier

DOI: https://doi.org/10.1556/004.2018.044

Permanent link to this page (URI)

https://res.slu.se/id/publ/96828